Liquid crystal display device having dummy electrodes with interleave ratio same on all sides

Abstract

A liquid crystal display device includes a pair of substrates having a plurality of display-use electrodes formed thereon, a seal for connecting the pair of substrates in such a manner that respective electrode forming surfaces face each other, a liquid crystal layer formed by sealing a liquid crystal in a space surrounded by the pair of substrates and the seal, and dummy electrodes for achieving a uniform thickness of the liquid crystal layer in the display area. The display-use electrodes and the dummy electrodes are interleaved on four sides of the seal, and an absolute value for variations in interleaved ratio in the four sides, indicative of a ratio of an area occupied by the display-use electrodes and the dummy electrodes on the seal is not more than a predetermined value. As this permits a uniform thickness of the seal on the four sides, a difference in brightness between a central portion and a portion in a vicinity of the seal in the display area can be eliminated, thereby improving a display quality.

What is claimed is: 
     
       1. A liquid crystal display device, comprising: a pair of substrates having a plurality of display-use electrodes formed thereon;   a seal for connecting said pair of substrates in such a manner that respective electrode forming surfaces face each other;   a liquid crystal layer formed by sealing a liquid crystal in a space surrounded by said pair of substrates and said seal;   dummy electrodes for achieving a uniform thickness of the liquid crystal layer within a display area;   wherein said display-use electrodes and said dummy electrodes are interleaved on each side of said seal, each side having an interleaved ratio representative of a ratio of an area occupied by said display use electrodes and said dummy electrodes in said each side to the entire seal area; and   wherein said display-use electrodes and dummy electrodes on each side are interleaved such that the interleaved ratio for each side of said seal is substantially the same as the interleaved ratio for each other side of the seal, thereby making the thickness of said seal in each side substantially uniform, and so as to reduce the variation in brightness of the display area in the vicinity of each side of the seal.   
     
     
       2. The liquid crystal display device as set forth in claim 1, wherein: said plurality of display-use electrodes includes at least one electrode sinuous section in at least one side of said seal, each electrode sinuous section including blocks of display-use electrodes so as to correspond to connection terminals for connection with external circuits;   each display-use electrode of each electrode sinuous section in said at least one side is formed in such a manner that an area on a side of said connection terminals for connection with external circuits has a higher alignment density than that of the display area; and   the interleaved ratio of said display-use electrode and dummy electrode in said one side having said electrode sinuous section is a sum of the interleaved ratio of said display-use electrodes and said dummy electrodes on said seal that are parallel to said display-use electrodes in the display area and said connection terminals and the interleaved ratio of other portions of the said display-use electrodes and dummy electrodes on said seal.   
     
     
       3. The liquid crystal display device as set forth in claim 1, wherein: said dummy electrodes includes between-electrodes dummy electrodes formed between said display-use electrodes and double dummy electrodes formed on one of said pair of substrates, which face the other substrate on which said display-use electrodes and said between-electrodes dummy electrodes are formed, and   said double dummy electrodes are formed so as to face said display-use electrodes and said between-electrodes dummy electrodes.   
     
     
       4. The liquid crystal display device as set forth in claim 3, wherein: said double dummy electrodes are formed so as to have a smaller width than that of said display-use electrodes and said between-electrodes dummy electrodes.   
     
     
       5. The liquid crystal display device as set forth in claim 3, wherein: the interleaved ratio of said display-use electrodes and said dummy electrodes is a sum of an interleaved ratio of said display-use electrodes and said between-electrodes dummy electrodes and an interleaved ratio of said double dummy electrodes.   
     
     
       6. The liquid crystal display device as set forth in claim 1, wherein: an interleaved ratio of said display-use electrodes and said dummy electrodes is a ratio of a width of electrodes with respect to a pitch of forming said display-use electrodes and said dummy electrodes.   
     
     
       7. The liquid crystal display device as set forth in claim 1, further comprising: stripe-shaped color filters, wherein said display-use electrodes are formed in accordance with said color filters.   
     
     
       8. A liquid crystal display device, comprising: a pair of substrates having formed thereon a plurality of display-use electrodes;   a seal for connecting said pair of substrates in such a manner that respective electrode forming surfaces face each other;   a liquid crystal layer formed by sealing liquid crystals in a space surrounded by said pair of substrates and said seal;   dummy electrodes for achieving a uniform thickness of said liquid crystal layer in a display areas;   wherein said display-use electrodes and said dummy electrodes are interleaved on each side of said seal, each side having an overlapped ratio representative of a ratio of an overlapped area of said display use electrodes and said dummy electrodes which face each other in said each side to the entire seal area; and   wherein said display-use electrodes and dummy electrodes on each side are interleaved such that the overlapped ratio for each side of said seal is substantially the same as the overlapped ratio for each other side of said seal and so as to reduce the variation in brightness of the display area in the vicinity of each side of the seal.   
     
     
       9. The liquid crystal display device as set forth in claim 8, wherein: said plurality of display-use electrodes includes at least one electrode sinuous section in at least one side of said seal, each electrode sinuous section including blocks of display-use electrodes so as to correspond to connection terminals to be connected to external circuits;   each display-use electrode of each electrode sinuous section of said at least one side is formed in such a manner that an area on a side of said connection terminals for connection with external circuits has a higher alignment density than that of the display area; and   the overlapped ratio of said display-use electrodes and said dummy electrodes in said one side having said electrode sinuous section is a sum of the overlapped ratio of said display-use electrodes and said dummy electrodes on said seal that are parallel to said display-use electrodes in said display area and to said connection terminals and an overlapped ratio of ather portions of said display-use electrodes and said dummy electrodes on said seal.   
     
     
       10. The liquid crystal display device as set forth in claim 8, wherein: said dummy electrodes includes between-electrodes dummy electrodes formed between said display-use electrodes and double dummy electrodes formed on one of said pair of substrates, which face the other substrate on which said display-use electrodes and said between-electrodes dummy electrodes are formed, and   said double dummy electrodes are formed so as to face said display-use electrodes and said between-electrodes dummy electrodes.   
     
     
       11. The liquid crystal display device as set forth in claim 10, wherein: said double dummy electrodes are formed so as to have a smaller width than that of said display-use electrodes and said between-electrodes dummy electrodes.   
     
     
       12. The liquid crystal display device as set fourth in claim 10, wherein: wherein said overlapped ratio of said display-use electrodes and said double electrodes and an overlapped ratio of said between-electrodes dummy electrodes and said double dummy electrodes.   
     
     
       13. The liquid crystal display device as set forth in claim 8, wherein: the overlapped ratio of said display-use electrodes and said dummy electrodes is a ratio of a width corresponding to a pitch of the overlapped area of said display-use electrodes and said dummy electrodes which face each other.   
     
     
       14. The liquid crystal display device as set forth in claim 8, wherein: said display-use electrodes and said dummy electrodes are interleaved on each side of said seal, each side having an interleaved ratio representative of a ratio of an area occupied by said display use electrodes and said dummy electrodes in said each side to the entire seal area; and   said display-use electrodes and dummy electrodes on each side are interleaved such that the interleaved ratio for each side of said seal is substantially the same as the interleaved ratio for each other side of the seal, thereby making the thickness of said seal in each side uniform, and so as to reduce the variation in brightness of the display area in the vicinity of each side of the seal.   
     
     
       15. The liquid crystal display device as set forth in claim 8, further comprising: stripe-shaped color filters, wherein said display-use electrodes are formed in accordance with said color filters.